The exponential functions of deterioration depth, complete deterioration depth and deterioration transition layer depth over time were established via indoor deterioration test on cement soil. The experimental results showed that the initial strength of cement-soil had no significant influence on the penetration resistance curve of degraded cement-soil. As an inhomogeneous body with the deterioration degree increasing with time, degraded cement-soil was composed of three parts: the completely degraded layer with a strength of almost zero, the transition layer whose strength increased with depth, and the undegraded zone whose strength could be regarded as the same as the standard curing cement-soil of the same age period. The deterioration depth, complete deterioration depth and transition layer depth of cement-soil reduced with the augment of the initial strength of cement-soil. In the prediction formula of deterioration depth against time, the coefficients were respectively the deterioration depth of cement-soil at 90 days of deterioration, the complete deterioration depth, and the deterioration transition layer depth. The value of the index was 0.6 regardless of the degradation type, indoor degradation test or field degradation test. At this time, the calculation results were consistent with the test results, and the formula could be used to predict the deterioration depth of cement-soil.
Key words
cement soil /
corrosion field /
micro-penetration test /
degradation depth /
prediction
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References
[1] HARA H, HAYASHI S, SUETSUGU D, et al. Study on the Property Changes of Lime-treated Soil under Sea Water[J]. Journal of Geotechnical Engineering of JSCE, 2010, 66(1): 21-31.
[2] IKEGAMIM. Physical Properties and Strength of Cement-treated Marine Clay after 20 years[C] //Proceedings of the 57th Annual Meeting, JSCE. Sapporo, Hokkaido: JSCE, September 25-27, 2002.
[3] 柳志平. 海水侵蚀环境下水泥土的力学性质试验研究及耐久性分析[D]. 武汉:武汉大学,2013.
[4] YANG Jun-jie, YAN Nan, LIU Qiang, et al. Laboratory Test on Long-term Deterioration of Cement Soil in Seawater Environment [J].Transactions of Tianjin University, 2016, 22(2):132-138.
[5] 闫 楠, 杨俊杰, 董猛荣, 等. 摩擦型桩表面劣化时的沉降特性室内模拟试验[J]. 哈尔滨工业大学学报, 2016,48 (2): 147-151.
[6] 杨俊杰, 孙 涛, 张玥宸, 等. 腐蚀性场地形成的水泥土的劣化研究[J]. 岩土工程学报, 2012, 34(1): 130-138.
[7] 王晓倩, 杨俊杰, 王 曼, 等. 场地环境变化引起的水泥土劣化深度及预测[J]. 中国海洋大学学报(自然科学版), 2019, 49(11): 102-110.
[8] 杨俊杰, 董猛荣, 孙 涛, 等. 现场条件下水泥土劣化试验及劣化深度预测[J]. 中国水利水电科学研究院学报, 2017,15(4):297-302.
[9] HAYASHI H, NISHIMOTO S, OHISHIK. Long-term Characteristics on Strength of Cement Treated Soil (Part 1)[R]. Hokkaido: Civil Engineering Research Institute of Hokkaido, 2004: 11-19.
[10] HAYASHI H, NISHIMOTO S, OHISHI K. Long-term Characteristics on Strength of Cement Treated Soil (Part 2)[R]. Hokkaido: Civil Engineering Research Institute of Hokkaido, 2004: 28-36.
[11] IKEGAMI M, ICHIBA T, TERASHIM. The Simple Prediction Method on the Deterioration of Cement Treated Soil[C] //Proccedings of the 2004 Annual Civil Engineering Conference and Exposition. Baltimore, Maryland, October 20-23, 2004.
[12] MIAO Jia-li. Evaluation on Long Term Durability of Cement Stabilized Soils under Seawater Environment[D]. Fukuoka: Kyushu University, 2013.
[13] 闫 楠. 滨海相软土场地形成的水泥土强度衰减过程研究[D]. 青岛:中国海洋大学, 2015.
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